高分 英文物理题
A horse in a harness racing starts to race pulling a carriage with a jockey in it. The horse exerts a backward force of 2800 N on the ground as it takes off. The mass of the jockey is 110 lbs, the mass of the carriage is 275 lbs, and the mass of the horse is 1100 lbs. If we set the direction of the motion of the horse to be the +x direction,
(a) What are the direction and the magnitude of the reaction force by the ground?
(b) What acceleration is produced, assuming the friction between the carriage and the ground is negligible?
(c) Calculate the force the horse exerts on the carriage.
(d) Calculate the force the carriage exerts on the jockey.